Documentation Supporting Draft and Final Emissions Factors

Supporting Documents for Draft and Final Actions

As performance data are collected in WebFIRE, emissions factors might be created or revised and drafted. If an emissions factor is drafted, there will be a 60 day public review period. After the public review period, the comments will be reviewed and the draft new/revised emissions factor will potentially be finalized and posted in WebFIRE. The supporting documentation for the emissions factor will be available through this page.

• Draft AP42 Chapter 9 Section 4 Livestock and Poultry Feed Operations and Air Emission Estimating Models for Animal Feed Operations posted November 2024. 
• Draft New and Revised Emissions Factors for Ceramic Products Manufacturing posted October 2024. 
• Final Revisions to AP-42 Chapter 7, Section 1 - Organic Liquid Storage Tanks posted October 2024.
• New and Revised Emissions Factors for Municipal Solid Waste Landfills posted August 2024. 
•  New and Revised Emissions Factors for Sewage Sludge Incineration posted May 2023.
• New and Revised Emissions Factors for Wood Residue Combustion in Boilers posted March 2022.
• New Emissions Factor for Portland Cement Manufacturing posted March 2022.
• Final Revisions to AP-42 Chapter 7, Section 7.1 - Organic Liquid Storage Tanks posted November 20, 2019; updated March 2020.
• New Emission Factors for Enclosed Ground Flares posted Feb. 5, 2018.
• New and Revised Emissions Factors for Flares and Certain Refinery Process Units posted April 20, 2015.